The Phase-I Trigger Readout Electronics Upgrade of the ATLAS Liquid Argon Calorimeters

Electronics developments have been pursued for the trigger readout of the ATLAS Liquid-Argon Calorimeter, which measures the energy of particles, towards the Phase-I upgrade scheduled in the LHC shutdown period of 2019-2020. The LAr Trigger Digitizer system located in the frontend of the calorimeter digitizes 34000 channels at a 40 MHz sampling with 12 bit precision after the bipolar shaper, and transmits to the LAr Digital Processing system of the backend to extract the transverse energies. Results of ASIC developments including QA and radiation hardness evaluations, performances of the final prototypes and results of the system integration tests will be presented along with the overall system design.